You can enclose one or more characters in square brackets to create a set; any character in the set will match.
可以使用方括号将一个或多个字符括起来，以创建一个集合，该集合中的任何字符都可以匹配。
The database character set and collation are used as default values if the table character set and collation are not specified in CREATE table statements.
如果在CREATETABLE语句中没有指定表字符集和校对规则，则使用数据库字符集和校对规则作为默认值。
The database character set and collation are used as default values if the table character set and collation are not specified in CREATE table statements.
如果在CREATETABLE语句中没有指定表字符集和校对规则，则使用数据库字符集和校对规则作为默认值。
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